Is there an easy way to create a model with multiple texture inputs and then easily switch between them?
In Object Properties tab add a custom property:

Right-click its value and choose Copy As New Driver:

Go to your shader and put a Mix RGB node as a switch between the two textures, right-click its Factor input and choose Paste Driver:

In 3D Viewport select your object (in Object Mode), press N to open the Numbers panel, expand Properties section and change the property.